Fordyce Tepee No. 1 is a privately owned earth dam located in Big Horn, Wyoming, on Tepee Creek. Completed in 1964, this irrigation dam stands at 25 feet tall with a hydraulic height of 20 feet and a structural height of 24 feet. The dam has a storage capacity of 120 acre-feet, serving purposes such as fire protection, stock watering, fish and wildlife habitat, as well as recreation.

With a low hazard potential and a moderate risk assessment rating, this dam has been inspected regularly, with the last inspection taking place in June 2020. It features an uncontrolled spillway, one outlet gate, and covers a surface area of 9 acres. The surrounding drainage area is 5.4 square miles, and the maximum discharge capacity of the dam is 710 cubic feet per second.

Despite being privately owned, Fordyce Tepee No. 1 is regulated by the state agency SEO and subject to state permitting, inspection, and enforcement. With its important role in irrigation and water resource management, this dam contributes to the water supply and ecosystem of the region, highlighting the intersection of water resources and climate considerations in this area.